Strongly anisotropic high-temperature Fermi surface of the Kondo semimetal CeNiSn revealed by angle-resolved photoemission spectroscopy

被引：9

作者：

Bareille, Credric ^{[1
]}

Nam, T-S ^{[2
]}

Takabatake, Toshiro ^{[3
]}

Kuroda, Kenta ^{[1
]}

Yajima, Takeshi ^{[1
]}

Nakayama, Mitsuhiro ^{[1
]}

Kunisada, So ^{[1
]}

Akebi, Shuntaro ^{[1
]}

Sakano, Masato ^{[4
,5
]}

Sakuragi, Shunsuke ^{[1
]}

Noguchi, Ryo ^{[1
]}

Min, Byung Il ^{[2
]}

Shin, Shik ^{[1
]}

Kondo, Takeshi ^{[1
]}

机构：

[1] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[2] POSTECH, Dept Phys, Pohang 37673, South Korea

[3] Hiroshima Univ, Grad Sch Adv Sci Matter, Higashihiroshima 7398530, Japan

[4] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan

[5] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 04期

关键词：

SEMICONDUCTORS CENISN; GAP FORMATION; ENERGY-GAP; SYSTEM; STATE; CE; MAGNETORESISTANCE; EXCITATION; PSEUDOGAP; CROSSOVER;

D O I：

10.1103/PhysRevB.100.045133

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The semimetallic behavior of the so-called "failed Kondo insulator" CeNiSn has been ascribed to a nodal line in the Kondo hybridization derived from a particular symmetry of the Ce 4f orbitals ground state. Here we investigate the geometry of the CeNiSn conduction band by combined angle-resolved photoemission spectroscopy (ARPES) in the high-temperature regime and Open core generalized gradient approximation plus spin-orbit coupling calculations, in order to determine how the nodal hybridization takes place. We identify the Fermi sheet involved in the semimetallic regime from its locus and its shape, respectively, in agreement with the expected nodal line and with quantum oscillations. We further extrapolate and discuss the low-temperature Fermi surface in terms of the expected nodal hybridization with a localized f-level. The obtained hypothetical low-temperature Fermi surface is compatible with the description from quantum oscillations, and with both the highly anisotropic magnetoresistance and the isotropic Nernst effect. This work offers an overview of the conduction band of CeNiSn before hybridization, and it paves the way to a definitive understanding of its low-temperature state. In addition, this work serves as a basis for more challenging low-temperature ARPES measurements.

引用

页数：9

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